Question

How to insert an element at a specific index in an array with C++

Answer 1

#include <iostream>

#define ARRSIZE 5
#define CAPACITY 10

void insertAtIndex(int arr[], int& size, int index, int element, int capacity) {
    if (size >= capacity) {
        std::cout << "Array is full, cannot insert element." << std::endl;
        return;
    }
    if (index < 0 || index > size) {
        std::cout << "Invalid index." << std::endl;
        return;
    }

    // Shift elements to the right
    for (int i = size; i > index; --i) {
        arr[i] = arr[i - 1];
    }

    // Insert the new element
    arr[index] = element;
    size++;
}

int main() {
    int arr[CAPACITY] = {4, 9, 8, 6, 5, 7};
    int size = ARRSIZE;    
    int index = 2;
    int element = 100;

    insertAtIndex(arr, size, index, element, CAPACITY);

    for (int i = 0; i < size; ++i) {
        std::cout << arr[i] << " ";
    }
}

  
  
/*
run:
  
4 9 100 8 6 5 
  
*/

 

70+ SQL courses for beginners and professionals